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Consider an elevator that is hanging from a strong cable. The elevator is initially at rest. It then accelerates upwards for 2 seconds, due to the cable pulling. It then then slows down, still moving upwards, until it comes to a stop. Pick out any and all answers that are correct: Compared to the weight of the elevator, the tension in the cable is
A) the same as the weight during the entire motion, due to Newton's third law
B) less than the weight while it is slowing down.
C) less than weight while it is speeding up
D) greater than the weight while speeding up
E) always greater than the weight during the whole time, or the elevator would not have been able to move up at all.
A satellite orbits at a distance from the Earth's center of about 4.80 Earth radii and takes 14.8 hours to go around once, What is its orbital velocity
A polar bear of mass 436 kg stands on an ice floe 58.10 cm thick. What is the minimum area of floe that will just support the bear in saltwater of density of 1030 kg/m3? The specific gravity of ice is 0.88.
Two converging lenses (f1 = 8.50 cm and f2 = 5.90 cm) are separated by 17.4 cm. The lens on the left has the longer focal length. Locate the final image relative to the lens on the right
The rms current in an ac circuit with a resistance of 130 O is 0.96 A. What is the average power consumed by this circuit
A person is making homemade ice cream. She exerts a force of magnitude 21 N on the free end of the crank handle on the ice-cream maker, what is the average power being expended
A bat flying in a cave emits the sound pulse and receives its echo in 3.5 s. How far away is the cave wall.
A point charge with a charge q1 = 2.60?C is held stationary at the origin. How much work is done by the electric force on q2
Two bugs are buzzing with the same frequency of 186Hz. One of the bugs is flying away from a stationary observer at 9.0m/s, What is the beat frequency that the observer hears
A novice skier, starting from rest, slides down a frictionless 35° incline whose vertical height is 118 m. Explain how fast is she going when she reaches the bottom? Illustrate what was the initial speed of the arrow?
Joe pushes down the length of the handle of a 12.6 kg lawn spreader. What force must Joe apply to the handle
A laser beam is incident on two slits 0.100 mm apart and a screen is placed 4 m from the slits. An interference pattern appears on the screen. what is the wavelength of the laser light
A K+ ion and a Cl ion are directly across from each other on opposite sides of a membrane 8.9 nm thick. What is the electric force on the K+ ion due to the Cl ion? Ignore the presence of other charges. What direction will it go in relation to the ..
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